What militarys use them? I have never seena US soldier with one. Closest I've seen is a HK video of a G36 w/ one.

Click the link on the left and check out the neat video.

www.betaco.com/P4-cmag-index.htm

I just cant get over how the speaker keeps talking about the disadvantages of "clips" when discussing why the BetaC is better than normal magazines.

Kharn

IIRC, there was a recent article on SAW type weapons under evaluation by the USMC in their soldier's magazine.  

The article indicated that the concept of the Beta mag was appreciated, examples tested had spotty performance-- some worked flawlessly, some didn't.  

This seems to be odds with the  majority of information that I have seen about C-mags elsewhere, but there it is.  You could go to your local state unversity to read up on the testing.  I also remember that the testers were not entirely happy with the M249 and that they remarked favorably on the Diemaco LMG version of the M16.  All in all, it seemed very strange.  

You know, I still don't see the C-Mag on a SAW. It sits sideways with the gun, creating an unbalanced firing platform. Anyway, I agree, this seems better for an assault rifle like the M4. There's a LSW version of the G36 that the German Army uses in conjunction with this magazine. I wonder if this magazine if the reason why they're making a heavier M4 barrel now. A heavy barreled M16 variant would make a great machinegun replacement to the SAW...at least until the barrel melts. My friend in ROTC though got to play with a SAW for about a week and he said he'd prefer that gun over the M16 any day irregardless of the weight though.

themao

Military forces rarely choose weapons which require the ammunition to be lubricated to feed from the magazine.  This doesn't mean these mags aren't used by special ops forces, but these units can tailor for every mission.